Improvement in duplex steam-boilers



J. B. RIVERA. Duplex Steam-Boiler.

Patented Oct. 30, 1877.

MIT

v UNITED .STATES PATENT OFFICE.

JAMES BARRERA RIVERA, OF BALTIMORE, MARYLAaND.

IMPROVEMENT IlN DUPLEX STEAM-BOILERS.

Specification iorming part of Letters Patent No. 196,597, dated October30, 1877; application il'ed september 29, 1877.

To all whom it may concern:

Be it known that I, JAirEs BARRERA RIVE- RA, of Baltimore, in the countyof Baltimore and State of Maryland, have invented certain i to evaporateliquids or cook substances in pans placed above the fire, and the heatedgases and products of combustion that would otherwise be wasted are usedto generate steam to operate a steam-engine, and, in connection withrevolving pans, used in making comts or other confections requiring tobe dried by heat. The steam thus generated may also be used for heatingrooms or other purposes.

My invention consists in a vertical annular steam-boiler having aninterior furnace or fire-place (open above when desired) connected, bymeans of descending lues and the base of said boiler, with a distinctvertical boiler or steam-reservoir having vertical lues extending fromthe base to the top.

It also consists in a vertical steam-,boiler having an interior re-placeand vertical lues above said lire-place, connected by two or morewater-pipes or passages with an annular vertical boiler, and a hollowbase connecting the smoke-iiues of both boilers, as will be hereinaftermore fully described.

In the drawings, A represents a hollow base or support for the boilers.It is made, preferably, of cast-iron, and is used as a connectingsmoke-liuc between the boilers B and C. For this purpose its top isformed with two circular openings a little smaller in diameter than theouter shell of either boiler. The boiler B is annular inform, and openat the top and bottom. It is furnished with a grate, b, upon which thefuel is placed from above by removing one of the covers d. This boilermay be provided with an opening and door on the side,

as shown at c on the boiler C, without departing from the spirit of myinvention; but it would make it more complex and reduce theheating-surface, and I prefer it without a door on the side. The innershell e of this boiler is united to the outer shell c by two horizontalannular plates, f and f l, to which are attached the vertical iiues f2,that carry the products of ,combustion downward into the hollow base A.The shell e extends down to the bottom of said base, and forms acircular ash-pit, out of which the ashes are removed through an openingthat can be closed by a door, g. The shell e extends down to the top ofsaid base A, upon which it rests; but it extends upward above the topplate f, and supports an annular plate, h, that can be made ofcast-iron, either solid or hollow. It is lianged on the outside and onthe inside to support a series of covers, d, graduated in size tosupport various sized pans, or a pan of large size can be made to reston the edge of the plate h, as shown in dotted lines in Fig. 2. Thespace between the plate'h and the top f of the boiler forms a passagefor the llame and heated gases to pass and enter the vertical tubes f2,through which they descend into the hollow base A, from which theyascend again through the vertical tubes c', extending to thesmoke-chamber c at the top of the boiler C. This boiler is four or livetimes higher than the boiler B. It is made out of a cylindrical shell,C, closed at the top by a plate, D, and riveted at the bottom to anannular plate, E. It contains a cylindrical lirechamber, F, riveted tothe annular plate E, and extending down to the bottom of the hollow baseA, forming the ash-pit under the grate b2. The top plate of thenre-chamber is connected by a series of tubes or smoke-lines with thetop plate D, as in ordinary vertical boilers. The boiler C is providedwith two sets of water-gages, the upper one, 7c, being located abouteighteen inches above the lower one, k', in a full-sized boiler, aboutive or six feet high, for purposes that will be explained hereinafter.The boiler is also provided with a steam-gage, l, and a safety-valvepipe, l. The boilers B and C are connected by two or more pipes toinsure a perfect circulation of water between the two. In the presentinstance, they are securely united by a large pipe, m,

about midway between the top and bottom of the boiler B, and anadditional pipe, n, connects the top of the boiler B with the boiler Cfor the hot water and steam to escape into the latter. The two boilersare also connected at the bottom by means of the pipe p, to clear theboilers of any sediment, and let it escape through the blow-Gif pipe qwhen desired. The side of the boiler B adjacent to the other boiler ismade one-half of an inch or an inch higher than the opposite side, toinsure its being full of water, and guard against burning of the topplate f.

These boilers are peculiarly adapted to the requirements ofconfectioners and others requiring an open furnace and nearly constantiire over which to heat the contents of pans, and the use of steam forvarious purposes. In the current of trade there are varying seasons ofactivity, requiring more or less steampower. I have found, byexperiments, that with a steam-boiler, as shown at B, of sixteen inchesinside diameter and fifteen inches high, and avery moderate re, I cangenerate steam equal to three or four horse power, and that the steamthus generated, being superheated in the boiler C by the surroundingfines gives lne, with thirty pounds pressure, the same degree of heat onrevolving drying-pans as forty pounds pressure with an ordinary boiler.When the boiler B is heated singly, the water in the adjacent boilerreaches only up to the lower water-gage k', leaving a largesteam-chamber above, where the steam is kept dry and superheated by thesurrounding pipes i, and can be maintained at eighty pounds pressurewhile using it for half an hour or so,

as required in making some kinds of confections, as caramel, rock-candy,&c. If both boilers are used together, with distinct fires, the water isadmitted up to the upper gage k, and steam produced in a very short timeequal to twelve or fourteen horse power. The space between the boilerscan be filled with bricks,

land the boilers felted and provided with exit steam-pipes, cocks, &c.,in the usual manner. The smoke-chamber and ues above the boiler C may bedivided, as shown by dotted lines, although I have found it not to benecessary with a chimney having a good draft. The base A is providedwith doors fr and s, closing openings through which the interior can becleaned.

Having now fully described my invention, I claim- Y 1. A verticalannular steam-boiler having an interior furnace or fire-place (openabove when desired) connected, by means of descending iiues and the baseof said boiler, with a distinct vertical boiler or steam-reservoirhaving vertical flues extending from the base to the top, substantiallyas and for the purpose described.

2. In combination with an annular steamboiler, as above described, avertical boiler having an interior re-placeand vertical ilues above saidfire-place, said boilers being connected by two or more water-pipes orpassages, and a hollow base connecting the smoke-fines of both boilers,as and for the purpose described.

JAS. BARRERA RIVERA. Witnesses:

THos. WBELAN, Jr., Gno. MCCAFFRAY.

